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( 7/9 - 47/72 ) : 1 1/4 = (56/72-47/72):1 1/4= 9/72:1 1/4= 1/8:1 1/4= 1/8*4/5= 4/40= 1/10
6 * ( 1 1/3 ) x2 = 6*4/3 x2= 24/3 x2= 8 x2
( 5/7 ) x2 :5/7 = (5/7) x2*7/5= 35/35 x2= 1 x2
( 1/3 - 1/4 ) x2 = (4/12-3/12) x2= 1/12 x2
( 2/5 ) x2 + 4 1/2 * 2 2/3 = (2/5) x2+9/2*8/3= (2/5) x2+72/6= (2/5) x2+12= 12 2/5 x2
5 * ( 1/2 ) x2 + 15 * ( 1/3 ) x2 = 5/2 x2+15/3 x2= 2 1/2 x2+5 x2= 7 1/2 x2
1/9 - ( 5/6 - 2/3 ) x2 = 1/9-(5/6-4/6) x2= 1/9-1/6 x2= 2/18-3/18 x2= -1/18 x2
Mam nadzieję, że dobrze rozwiązałam ;)